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Alterations in lipid mediated signaling and Wnt/ β -catenin signaling in DMH induced colon cancer on supplementation of fish oil.

Authors
Type
Published Article
Journal
BioMed Research International
2314-6141
Publisher
Hindawi Limited
Publication Date
Volume
2014
Pages
832025–832025
Identifiers
DOI: 10.1155/2014/832025
PMID: 24999478
Source
Medline
License
Unknown

Abstract

Ceramide mediates inhibition of cyclooxygenase-2 (COX-2) which catalyzes formation of prostaglandin further activating peroxisome proliferator-activated receptor γ (PPAR γ ) and Wnt/ β -catenin pathway; and hence plays a critical role in cancer. Therefore, in current study, ceramide, COX-2, 15-deoxy prostaglandin J2(15-deoxy PGJ2), PPAR γ , and β -catenin were estimated to evaluate the effect of fish oil on lipid mediated and Wnt/ β -catenin signaling in colon carcinoma. Male Wistar rats in Group I received purified diet while Groups II and III received modified diet supplemented with FO : CO(1 : 1) and FO : CO(2.5 : 1), respectively. These were further subdivided into controls receiving ethylenediaminetetraacetic acid and treated groups receiving dimethylhydrazine dihydrochloride (DMH)/week for 4 weeks. Animals sacrificed 48 hours after last injection constituted initiation phase and those sacrificed after 16 weeks constituted postinitiation phase. Decreased ceramide and increased PPAR γ were observed in postinitiation phase only. On receiving FO+CO(1 : 1)+DMH and FO+CO(2.5 : 1)+DMH in both phases, ceramide was augmented whereas COX-2, 15-deoxy PGJ2, and nuclear translocation of β -catenin were reduced with respect to cancerous animals. Decrease was more significant in postinitiation phase with FO+CO(2.5 : 1)+DMH. Treatment with oils increased PPAR γ in initiation phase but decreased it in postinitiation phase. Hence, fish oil altered lipid mediated signalling in a dose and time dependent manner so as to inhibit progression of colon cancer.

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